Does Blender offer network rendering on a LAN
There is no accepted, included, out-of-the-box way right now.  It's on the roadmap of features for them to add, but they haven't reached that feature yet.

Not to say you can't do it, though.  It will just involve custom scripts, python scripts, and some fiddling around to get it going.  Google "Blender network rendering", "Blender distributed rendering", and "Blender render farm" for some ideas.  Without more details about your situation, I can't really recommend anything more specific.